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authorRajendra Nayak <rnayak@ti.com>2011-11-18 16:47:17 +0530
committerMark Brown <broonie@opensource.wolfsonmicro.com>2011-11-23 18:46:55 +0000
commit8f446e6fa1d506be2cb80f91c214f1705327c7f9 (patch)
treee0c87fe06aceaf333311f57bf831a027188666b3 /drivers/regulator/of_regulator.c
parentcfcfc9eca2bcbd26a8e206baeb005b055dbf8e37 (diff)
regulator: helper routine to extract regulator_init_data
The helper routine is meant to be used by the regulator drivers to extract the regulator_init_data structure from the data that is passed from device tree. 'consumer_supplies' which is part of regulator_init_data is not extracted as the regulator consumer mappings are passed through DT differently, implemented in subsequent patches. Similarly the regulator<-->parent/supply mapping is handled in subsequent patches. Also add documentation for regulator bindings to be used to pass regulator_init_data struct information from device tree. Some of the regulator properties which are linux and board specific, are left out since its not clear if they can be in someway embedded into the kernel or passed in from DT. They will be revisited later. Signed-off-by: Rajendra Nayak <rnayak@ti.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'drivers/regulator/of_regulator.c')
-rw-r--r--drivers/regulator/of_regulator.c81
1 files changed, 81 insertions, 0 deletions
diff --git a/drivers/regulator/of_regulator.c b/drivers/regulator/of_regulator.c
new file mode 100644
index 000000000000..76673c784ab8
--- /dev/null
+++ b/drivers/regulator/of_regulator.c
@@ -0,0 +1,81 @@
+/*
+ * OF helpers for regulator framework
+ *
+ * Copyright (C) 2011 Texas Instruments, Inc.
+ * Rajendra Nayak <rnayak@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/regulator/machine.h>
+
+static void of_get_regulation_constraints(struct device_node *np,
+ struct regulator_init_data **init_data)
+{
+ const __be32 *min_uV, *max_uV, *uV_offset;
+ const __be32 *min_uA, *max_uA;
+ struct regulation_constraints *constraints = &(*init_data)->constraints;
+
+ constraints->name = of_get_property(np, "regulator-name", NULL);
+
+ min_uV = of_get_property(np, "regulator-min-microvolt", NULL);
+ if (min_uV)
+ constraints->min_uV = be32_to_cpu(*min_uV);
+ max_uV = of_get_property(np, "regulator-max-microvolt", NULL);
+ if (max_uV)
+ constraints->max_uV = be32_to_cpu(*max_uV);
+
+ /* Voltage change possible? */
+ if (constraints->min_uV != constraints->max_uV)
+ constraints->valid_ops_mask |= REGULATOR_CHANGE_VOLTAGE;
+
+ uV_offset = of_get_property(np, "regulator-microvolt-offset", NULL);
+ if (uV_offset)
+ constraints->uV_offset = be32_to_cpu(*uV_offset);
+ min_uA = of_get_property(np, "regulator-min-microamp", NULL);
+ if (min_uA)
+ constraints->min_uA = be32_to_cpu(*min_uA);
+ max_uA = of_get_property(np, "regulator-max-microamp", NULL);
+ if (max_uA)
+ constraints->max_uA = be32_to_cpu(*max_uA);
+
+ /* Current change possible? */
+ if (constraints->min_uA != constraints->max_uA)
+ constraints->valid_ops_mask |= REGULATOR_CHANGE_CURRENT;
+
+ if (of_find_property(np, "regulator-boot-on", NULL))
+ constraints->boot_on = true;
+
+ if (of_find_property(np, "regulator-always-on", NULL))
+ constraints->always_on = true;
+ else /* status change should be possible if not always on. */
+ constraints->valid_ops_mask |= REGULATOR_CHANGE_STATUS;
+}
+
+/**
+ * of_get_regulator_init_data - extract regulator_init_data structure info
+ * @dev: device requesting for regulator_init_data
+ *
+ * Populates regulator_init_data structure by extracting data from device
+ * tree node, returns a pointer to the populated struture or NULL if memory
+ * alloc fails.
+ */
+struct regulator_init_data *of_get_regulator_init_data(struct device *dev)
+{
+ struct regulator_init_data *init_data;
+
+ if (!dev->of_node)
+ return NULL;
+
+ init_data = devm_kzalloc(dev, sizeof(*init_data), GFP_KERNEL);
+ if (!init_data)
+ return NULL; /* Out of memory? */
+
+ of_get_regulation_constraints(dev->of_node, &init_data);
+ return init_data;
+}